Yep, it's totally safe to leave Euclid behind. What could possibly go wrong? It's not like there's actually an insane murderer running around the floating island/school like Leon thinks, right?
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Oh yeah, there's the Godmodder. Who's likely very pissed after almost being killed by a falling rock. And who has proven himself to be a killer in the past, quite possibly the very recent past. So... whoopsie?